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Nasal-Interpreter
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Add recognition for assignment

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Valk Richard Li 2019-08-17 20:35:24 +08:00 committed by GitHub
parent 0a1c9a69bf
commit 38132815e2
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 87 additions and 6 deletions
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93
version0.4/nasal_parse.h
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@ -46,6 +46,7 @@ class parse
bool hashmember_check(); bool hashmember_check();
bool hashmembers_reduction(); bool hashmembers_reduction();
bool definition_check(); bool definition_check();
bool assignment_check();
void parse_work(token_list&); void parse_work(token_list&);
void print_stack(); void print_stack();
void stack_set_empty(); void stack_set_empty();
@ -317,6 +318,77 @@ bool parse::definition_check()
} }
return false; return false;
} }
bool parse::assignment_check()
{
int tbl[6]={0};
std::stack<parse_unit> temp;
for(int i=0;i<6;++i)
{
if(parser.empty())
break;
temp.push(parser.top());
tbl[i]=temp.top().type;
parser.pop();
}
for(int i=0;i<6;++i)
{
if(temp.empty())
break;
parser.push(temp.top());
temp.pop();
}
if((tbl[3]==__identifier) && (tbl[2]==__equal) && ((tbl[1]==__identifier) || (tbl[1]==__scalar)) && (tbl[0]==__semi))
{
parse_unit t;
t.type=__assignment;
t.line=parser.top().line;
for(int i=0;i<4;++i)
parser.pop();
parser.push(t);
return true;
}
else if((tbl[4]==__identifier) && (tbl[3]==__equal) && (tbl[2]==__left_bracket) && (tbl[1]==__right_bracket) && (tbl[0]==__semi))
{
parse_unit t;
t.type=__assignment;
t.line=parser.top().line;
for(int i=0;i<5;++i)
parser.pop();
parser.push(t);
return true;
}
else if((tbl[4]==__identifier) && (tbl[3]==__equal) && (tbl[2]==__left_brace) && (tbl[1]==__right_brace) && (tbl[0]==__semi))
{
parse_unit t;
t.type=__assignment;
t.line=parser.top().line;
for(int i=0;i<5;++i)
parser.pop();
parser.push(t);
return true;
}
else if((tbl[5]==__identifier) && (tbl[4]==__equal) && (tbl[3]==__left_bracket) && ((tbl[2]==__scalar) || (tbl[2]==__scalars) || (tbl[2]==__identifier) || (tbl[2]==__identifiers)) && (tbl[1]==__right_bracket) && (tbl[0]==__semi))
{
parse_unit t;
t.type=__assignment;
t.line=parser.top().line;
for(int i=0;i<6;++i)
parser.pop();
parser.push(t);
return true;
}
else if((tbl[5]==__identifier) && (tbl[4]==__equal) && (tbl[3]==__left_brace) && ((tbl[2]==__hash_member) || (tbl[2]==__hash_members)) && (tbl[1]==__right_brace) && (tbl[0]==__semi))
{
parse_unit t;
t.type=__assignment;
t.line=parser.top().line;
for(int i=0;i<6;++i)
parser.pop();
parser.push(t);
return true;
}
return false;
}
void parse::stack_set_empty() void parse::stack_set_empty()
{ {
while(!parser.empty()) while(!parser.empty())
@ -426,32 +498,41 @@ void parse::parse_work(token_list& lexer)
{ {
if(scalars_reduction()) if(scalars_reduction())
{ {
std::cout<<"line "<<parser.top().line<<": scalars"<<std::endl; std::cout<<"line "<<parser.top().line<<": Scalars"<<std::endl;
continue; continue;
} }
if(identifier_check()) if(identifier_check())
{ {
std::cout<<"line "<<parser.top().line<<": identifier | call function | call hash | call array"<<std::endl; std::cout<<"line "<<parser.top().line<<": Identifier | Call function | Call hash | Call array"<<std::endl;
continue; continue;
} }
if(identifiers_reduction()) if(identifiers_reduction())
{ {
std::cout<<"line "<<parser.top().line<<": identifiers"<<std::endl; std::cout<<"line "<<parser.top().line<<": Identifiers"<<std::endl;
continue; continue;
} }
if(hashmember_check()) if(hashmember_check())
{ {
std::cout<<"line "<<parser.top().line<<": hash member"<<std::endl; std::cout<<"line "<<parser.top().line<<": Hash member"<<std::endl;
continue; continue;
} }
if(hashmembers_reduction()) if(hashmembers_reduction())
{ {
std::cout<<"line "<<parser.top().line<<": hash members"<<std::endl; std::cout<<"line "<<parser.top().line<<": Hash members"<<std::endl;
continue; continue;
} }
if(definition_check()) if(definition_check())
{ {
std::cout<<"line "<<parser.top().line<<": definition"<<std::endl; std::cout<<"line "<<parser.top().line<<": Definition"<<std::endl;
continue;
}
//assignment check must be put behind the definition check
//because the assignment check has the same method to check
//but assignment checks without a "var" so if you put the
//assignment before definition,there may be a mistake.
if(assignment_check())
{
std::cout<<"line "<<parser.top().line<<": Assignment"<<std::endl;
continue; continue;
} }
reduction_complete=true; reduction_complete=true;